Reddit reviews Yueton 100pcs Female Fully Insulated Wire Crimp Terminal Nylon Quick Connectors Wiring Spade (Female)

You should be using quick-connect crimped terminals. That's why they have the blades like they do.

Soldering can actually damage the internals of switches from overheating.

Don't get the kind you linked to with the metals exposed. Get fully insulated ones like https://www.mcmaster.com/#7243k111 https://www.amazon.com/dp/B010GWZOUW/ref=asc_df_B010GWZOUW5487366

Get some spade terminals to crimp on the wire. I've had a lot of issues with the thread the wire through and twist it approach. It works fine at first but often tends to work loose and oxidize over time and starts cutting out.

Sure. You can do it a couple ways -

1. Connect the EVH 5150iii FX Send OUT to the Katana 100's FX Return, which bypasses the Katana's preamp (make sure you set up the FX loop in the Kanata/Tone Studio so that you have access to all the FX slots) and use the SS Power Amp side to drive the Katana's speaker. NOTE: The EVH 5150 iii is a Tube amp, so you MUST have a load on the amp (speaker or dummy/attenuator load) hooked up to the speaker out before doing this. Not doing it will break something important in the EVH, and it will cost you money.
   
   
2. Disconnect the speaker leads from the Katana's speaker and hook up a speaker cable that connects to the EVH 5150iii's speaker out. Select the proper impedance from the EVH's cab selector, and you'll essentially use the Katana 100 as an open back cabinet for the 5150iii head. The 5150iii lunchbox is only 15W, so you'll not have any issues overpowering the Katana 100's speaker. NOTE: IF YOU DO THIS, consider replacing the cheap spade connectors that are currently on the Katana's speaker hook ups. IF THESE CONNECTORS TOUCH EACH OTHER AND THE KATANA IS POWERED ON, YOU WILL BLOW THE KATANA'S AMPILIFER, which will render your Katana dead.
   
   I HIGHLY recommend cutting off the cheap female spades that are on the Katana's speaker leads and replacing them with some crimp on INSULATED female spades like these:
   
   https://www.amazon.com/Yueton-100pcs-Insulated-Terminal-Connectors/dp/B010GWZOUW/ref=pd_lpo_vtph_60_bs_t_1?_encoding=UTF8&psc=1&refRID=3X943RD62DVH2NFTZ8RZ
   
   You can find them at any hardware store, and will protect the spades from touching each other if you accidentally turn the Katana on without having the leads connected to a speaker and prevent them from shorting between each other and damaging your Katana.

spade connectors and a crimper!

https://www.amazon.com/Yueton-100pcs-Insulated-Terminal-Connectors/dp/B010GWZOUW/ref=sr_1_23?keywords=spade+connectors+crimper&qid=1567634312&s=hi&sr=1-23

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https://www.amazon.com/WGGE-Professional-crimping-Multi-Tool-Multi-Function/dp/B073YG65N2/ref=sr_1_4?keywords=wire+stripper+crimper&qid=1567634471&s=hi&sr=1-4

No, it doesn't matter at all, you just need a 12 volt power source like the cigarette lighter receptacle. There are also a lot of car modification shops if you want someone to do the installation for you.

If you want to just get one of the inexpensive backup cameras from Amazon you should check out some video tutorials to get started. Some people power the camera off of the reverse light (you know, the white lights on the back of cars when they go in reverse). That means that the camera stays off until you go into reverse. Personally I just leave my camera on, so I power everything off of my Cigarette Lighter Receptacle. Here are the parts I used:

A camera and monitor.

A cigarette lighter receptacle adapter.

A terminal strip. (This connects the cigarette receptacle to the camera and monitor).

Extension cable to connect your camera to your terminal strip.

Wire crimp connectors to connect the camera to your extension cable.

Optionally, but recommended: A cigarette receptacle splitter so you have extra power ports.

Sorry if my way of doing it is a little hacky, but it works. Let me know if you have any questions.